This paper deals with the changes of soil animal community structure in contami- nated and irrigated area by organophosphorus pesticide, and inquired into the mechanism of this effect. The results showed that the species and quantities of the soil animals were de- creased with increasing of pesticide pollution degree. In heavy pollution area, 1, 2 plot, there were 21 species and 22 species of the soil animals collected, the animal densities were 28 571 and 5l 269 ind. /m2 respectively. In middle and light p...